Research and Development of new dielectric Ceramics

新型介电陶瓷的研发

• 批准号: 60470069
• 负责人: YANAGIDA Hiroaki
• 金额: $ 3.52万
• 依托单位: Univeristy of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60470069/
• 关键词: dielectric ceramics; ferroelectrics; peiezoelectrics; resonance; fibrous barium titanate; fibrous lead titanate; Curie point; 共有結合エネルギー

Relation between dielectric properties and olientation of grains, synthesis of fibrous grains as starting materials of piezoelectric ceramics, and relation between ferroelectric Curie points and combination of elements were investigated. Materials having perovskite-type crystal structure, which tends to have ferroelectricity, was mainly dealed with.(1) Barium titanate ceramic which made of fibrous grains were inovated, which had a peculiar piezoelectric phenomena. The precurcer of the fibrous barium titanate was potassium titante. Only its planar-extensional resonance was observed and its thickness resonances were not, though ordinary piezoelectrics have both.(2) Lead titanate fibers were synthesized by a hydroxide. The yield of fibrous solution and the reaction temperature. The obtained lead titante was determined to be tetragonal and the fibers were 50-100 um in length and1-10 um in diameter.(3) What kinds of perovskite-type ferroelectrics show a high or low Curie point was illustrated. It was found that the covalent bond energy of interatomic bonding were showing high correlation with Curie points. Perovskite-type oxides with lower covalent bond energy show higher Curie points.

研究了介电性能与晶粒的olioliti、作为压电陶瓷起始材料的纤维颗粒的合成以及铁电居里点与元素组合的关系。主要研究具有钙钛矿型晶体结构，具有铁电性的材料。(1)创新了由纤维颗粒制成的钛酸钡陶瓷，具有特殊的压电现象。纤维钛酸钡的前驱体是钛酸钾。普通压电材料既有平面-伸展共振，也有厚度共振，但只有平面-伸展共振。(2)采用氢氧化物合成钛酸铅纤维。纤维溶液的产率与反应温度。测定所得的钛酸铅为四边形，纤维长度为50 ~ 100 μ m，直径为1 ~ 10 μ m。(3)说明了钙钛矿型铁电体的居里点高低。发现原子间键的共价键能与居里点有较高的相关性。具有较低共价键能的钙钛矿型氧化物具有较高的居里点。

项目成果

Y.Ohara, K.Koumoto and H.Yanagida: "Barium Titanate Ceramics with High Piezoelectricity Fabricated from Fibrous Particles" J.Am.Ceram.Soc.68 [4]. C108-C109 (1985)

Y.Ohara、K.Koumoto 和 H.Yanagida：“由纤维颗粒制造的高压电钛酸钡陶瓷”J.Am.Ceram.Soc.68 [4]。

T.Nishi, S.Fujitsu, M.Miyayama, K.Koumoto and H.Yanagida: "Application of Fibrous Titanate to Electric Materials Synthesis of piezoelectric PbTi <O_3> fibers" Tokyo Daigaku Kougaku-bu Sougoushikenjo Nenpou. 45. 137-142 (1986)

T.Nishi、S.Fujitsu、M.Miyayama、K.Koumoto 和 H.Yanagida：“纤维状钛酸盐在压电 PbTi <O_3> 纤维的电气材料合成中的应用”东京大学工学部 Sougoushikenjo Nenpou。

西哲也: 東京大学工学部総合試験所年報. 45. 137-142 (1986)

Tetsuya Nishi：东京大学工程学院综合实验室年度报告。45. 137-142 (1986)。

五十嵐香: J.Mater.Sci.

五十岚薰：J.Mater.Sci。

K.Igarashi, K.Koumoto and H.Yanagida: "Ferroelectric Curie Points of Perovskite-Type Oxides" J.Mater. Sci.in press.

K.Igarashi、K.Koumoto 和 H.Yanagida：“钙钛矿型氧化物的铁电居里点”J.Mater。